Erratic doesn't have a meaning related to error. It means eccentric, or unsteady instead. Error has its adjective form as erroneous and errant. So what is the noun of erratic?
Learn English – the noun form of “erratic”
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Best Answer
ODO shows erraticism as the noun.
It is related to error in that they both stem from Latin errare, to stray (from the truth in one case, from the straight and narrow in the other).